256122006615 has 64 divisors (see below), whose sum is σ = 467769323520. Its totient is φ = 132868149120.

The previous prime is 256122006607. The next prime is 256122006619. The reversal of 256122006615 is 516600221652.

256122006615 is a `hidden beast` number, since 2 + 5 + 6 + 12 + 20 + 0 + 6 + 615 = 666.

It is not a de Polignac number, because 256122006615 - 2³ = 256122006607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256122006615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256122006619) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27502810 + ... + 27512120.

It is an arithmetic number, because the mean of its divisors is an integer number (7308895680).

Almost surely, 2^256122006615 is an apocalyptic number.

256122006615 is a deficient number, since it is larger than the sum of its proper divisors (211647316905).

256122006615 is a wasteful number, since it uses less digits than its factorization.

256122006615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14869 (or 14863 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 256122006615 in words is "two hundred fifty-six billion, one hundred twenty-two million, six thousand, six hundred fifteen".